What steps can be taken to troubleshoot and resolve issues related to headers, sessions, and image output in PHP?

Issue: Headers already sent error in PHP can be resolved by ensuring that no whitespace or output is sent before calling the header() function. This can be fixed by removing any whitespace or output before the header() function call. Code snippet: 

<?php
ob_start(); // Start output buffering
// Your PHP code here
header('Location: http://www.example.com');
ob_end_flush(); // Flush output buffer
?>

Keywords

Headers Sessions Image Output Troubleshooting PHP

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